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    <title>const 定义常量</title>
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    <script>
        //声明常量
        const SCHOOL = '尚硅谷';
        
        //1. 一定要赋值初始值
        //const A;
        //2.一般常量使用大写(潜规则)
        //3.常量的值不能修改
        //4.块级作用域
    </script>
    
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